PiHub - a robust powered hub, made especially for your Raspberry Pi - Raspberry Pi
The Raspberry Pi Hobbyist: USB Hub Modified to Back Feed Power
Pi Hard, with a vengeance! : Backfeed / problem USB Hub(s) on the RPi!
Problems with power - Model B - Backfeed from USB hubs? - Raspberry Pi Forums
UUGear 7-Port USB Hub for Raspberry Pi | UUGear
Pi 4 fails to boot when active USB switch attached - Raspberry Pi Forums
Raspiado - the USB hub that fits your Raspberry Pi - Power your RPi, add USB ports, and look great doing it - Kickstarter Project : r/raspberry_pi
Amazon.com: SABRENT Premium 4 Port Black Aluminum USB 3.0 Hub (30" Cable) for iMac, MacBook, MacBook Pro, MacBook Air, Mac Mini, or Any PC [Black] (HB-MC3B) : Everything Else
How to protect a Raspberry Pi from a powered hub.
UUGear 7-Port USB Hub for Raspberry Pi | UUGear
Will this usb hub backfeed my rpi : r/raspberry_pi
power - Is using a powered hub with the Pi safe - Raspberry Pi Stack Exchange
prevent usb 5V backfeeding
usb - Alternative to polyfuse mod - Raspberry Pi Stack Exchange
How many external HDDs can you have in a Raspberry Pi 4 8gb? - #17 by matthewjbauer - Chia Farming & Harvesting - Chia Forum
Pi 4 fails to boot when active USB switch attached - Raspberry Pi Forums